added guard condition to FBVLC::open()
added guard condition to FBVLC::open()

xinjiguaike/fbvlc,RSATom/fbvlc,RSATom/fbvlc,RSATom/fbvlc,RSATom/fbvlc,RSATom/fbvlc,xinjiguaike/fbvlc,xinjiguaike/fbvlc,xinjiguaike/fbvlc